Safety mechanism for firearms



R. VON FRQMMER SAFETY MECHANISM FOR FIREARMS Aug. 21, 1923.

Filed Aug. 10, 1926 Patented Aug. 21, 1928.

" qnunotr VQN 'FROMMER, or. 'iu'nAznsr, nuiveanyg 7 SAFETY MECHANISM FORFIREARMS."

', J Application filed August 10, 1926, Serial No. 128,496, and inHungary August 14, 1925.

According to the present invention the firing pin or some part of thegun connected therewith, for example the firing pin nut, is providedwith a projection and the breech f casing with a groove, or the breechcasing is provided with a projection and the other part of the gun witha groove, so that in the rear position of the firing pin the projectionmay be turned into the groove, the firing pin being thereby secured inits rearposition.

In the accompanying drawing one form of the mechanism according to theinvention is v diagrammatically shown by way of example.

Fig. 1 is a horizontal, longitudinal sectional-view of the breech bolt,the breech casing and part of the barrel, the breech bolt being fullyclosed.

Fig. 2 shows the tooth of the breech bolt and the notch of thefiring-pin-nut in en- ,gagement.

Fig. 3 is the same View as Fig. 1 the 'handle, however, being turnedwith 90.

Fig. 4 is a vertical, longitudinal sectional view of the mechanism thefiring pin being cocked, while Fig. 5 is a cross sectional view taken onlines VV of Fig. 1 the firing pin being secured.

In the breech casing 2 which is connected to the barrel 1 the breechbolt 3 is arranged in a well known manner. The handle 4 of the breechbolt in its closed or turned down position bears with its root-portion 5against the surface 6 of the breech casing 2 thereby effecting thelocking of the breech bolt. The firing pin 7, arranged in the breechbolt is subject to the action of a spring 8 and is screwed together withthe firing-pin-nut 9.

According now to the invention there is arranged on the breech bolt 3 atooth 10 which registers in the closed position of the breech, as inFig. 1,with the notch 11 provided in the firing-pin-nut, this enablingthe firing-pin to discharge the cartridge pushed in the barrel. In everyother position of the breech bolt, that is if the handle 4 is not fullyturned down this is impossibility because the tooth 10prevent-sthe'.firing-pinnut and thereby the' firing pin from completingtheir forward movement (Fig. 3).

For the purposeof preventing an unintentional shooting forward of thefiring pin 7 or the firing-pin-nut 9 there 'is arranged on the latter aprojection 12 which may be turned into a groove 13 provided in thebreech casing 2 by pulling backwards and rotating the firing pin bymeans of the knob 15, whereby the firing .of the gun is made impossiblebecause the groove 13 retains the firing pin by means of the projection12. If it is desired to terminate thelocking of the firing pinthe projection 12 V is turned out from the groove 13 and is let gentlyforward.

In order to prevent the projection 12 from accidentally turning out fromthe groove 13 the latter is provided with a notch 14 (Fig. 4) which isformed onthe front side of the groove, and joins at its top side, at 17the bore of the breech casing (Fig. 5). In other words the notch 14 isnot open while the groove 13 is open for permitting of the projection 12to be; turned into the groove. By pulling now the firing pin backwardsand releasing it after turning,

into the groove 13 the firing spring 8 will press the projection 12 ofthe firing pin in the notch 14 which as it is not open will not allowthe projection to turn out. For releasing the projection 12,that is tosay the firing pin, the same is first to be slightly drawn backwards sothat the projection 12 may again enter the groove 13 wherefrom it may beturned out. The projection 12 beside that above mentioned, has anotherfunction that of guiding the firing-pin-nut which function is performedby its being guided in the slot 16 in which the root-portion 5 of thehandle 4 is guided in a well known manner.

Obviously, the, tooth 10 and its corresponding notch 11 might bereversedly arranged, that is to say the tooth may be pro vided on thefiring-pin-nut and the notch on the breech bolt. In the same manner theprojection 12 and the groove 13 may also be reversedly arranged, that isto say the groove on the firing-pin-nut and the projection on the breechcasing. One of the two engagement elements may be arranged instead of onthe firing-pin-nut on the firingthe firing pin.,

2. In firearms of the kind described aw '1. In firearms of the kinddescribed 'a breech casing and a'firing'pin the said fir-. 7

ing pin having a, projection and the said breech casing having a groovemeans on the saidfiringpin to turn its projection -1n :the;

said groove in the pulled back position of pinhaving a projectionandsaid breech cas- 1D" having a groove, ,said groove being providedwithat notch means on the firing pin to turn its projectioninthe'said notchof the groovein the pulled back position of the firing pinsubstentiallyas described.

In testimony whereof I have afiixed my signature. v

RUDOLF v. FRQ MER. r

breech casing and a firingpin said firing r

